JPS61279341A - Mold cooler for belt type continuous casting machine - Google Patents

Abstract

PURPOSE:To improve the surface characteristic of an ingot by disposing cooling water guides spaced at a specified distance and providing finned rolls which support the belts by inserting the fins into the notched grooves of the cooling water guides. CONSTITUTION:The belts 5, 5' are synchronously driven in the directions opposite from each other via drive pulleys 3, 3' and the molten metal 10 of a tundish 9 is poured between the belts 5 and 5'. The molten metal 10 is cooled with cooling water by the finned rolls 17, 17' in a meniscus part 24 and is cooled with the finned rolls 52 and cooling pads 53 having the cooling water guides in a casting area 25. The rolls 52 support the belts 5, 5' by the fins inserted into the notched grooves of the cooling water guides. The contact of the belts 5, 5' and the fins is made rolling resistance and the oscillation of the belts is prevented by the above-mentioned mechanism. The surface characteristic of the ingot is thus improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a mold cooling device in a belt-type continuous casting machine.

(Prior art) In recent years, as part of the rationalization of rolling, for example, the material to be rolled (slab) supplied to a hot strip mill has been reduced in thickness to almost the same thickness as the hot strip product. The company hopes to eliminate the rolling process and save energy.

For this reason, various types of continuous metal sheet casting machines have been proposed, and below, a belt-type continuous casting machine (belt caster) will be described.

[Conventional belt type continuous casting machine]

FIG. 6 is a side sectional view of a mold cooling device in a conventional belt caster, and FIG. 7 is a view taken along the line A-AM in FIG. 6.

As shown in FIGS. 6 and 7, the conventional molding apparatus 1' has a pair of tension pulleys 2, 2' placed below a tundish 9 containing molten metal [10 (hereinafter referred to as molten metal)]. Drive pulleys 3 and 3' are connected to those pulleys 2 and 2.
', 5.5' steering pulley 4,
Steel belt 5 is placed on pulley 2/, 51° 4', and steel belt 5' is placed on pulley 2/, 51° 4'.
is wrapped around the belt 5-.

They are arranged in parallel with a gap corresponding to the thickness T of the slab 7 between the opposing surfaces of the slabs, and are driven in opposite directions (in the direction of arrow B) via drive pulleys 3 and 3' by a power drive device (not shown). It is designed to be rotated synchronously with. Above the gap, a pair of short side molds 8 are arranged at both ends of the belt 5.5' in the width direction, and the tension pulley 2
, 2' and the belt 5. of the meniscus portion 24 of the molten metal 10 between the drive pulleys 3, 3'. A plurality of (two in the example) fin rolls 17 and 17' are provided on the back surface of each of the fin rolls 17 and 17' so as to be in contact with each other. On the outer periphery of the tension rolls 2 and 2', there is a jet cooling system consisting of jet pipes 13 between cooling water, which are respectively wrapped around a large number of annular grooves 12 bored in parallel over at least the entire width of the slab 7. belt 5. of the casting zone 25 downstream of the mechaniscus section 24. A pair of closed box-shaped cooling pads 41 and 41' covering at least the entire width of the slab 7 are fixed to the base 18 so as to face each other on the back side of the slab. The cooling pad 41.
41' is belt 5. A horizontal partition 28a protruding to a predetermined height, for example, several meters, and a horizontal partition 281 that does not protrude are formed on the wall 44 on the side of the camera, and a plurality of rooms (for example, four rooms 42a) are arranged in the vertical direction.
, J2'b, 44a, 43b), and a rectangular groove 46 consisting of a cooling water supply/discharge slit 56, 57 and a plurality of vertical partition walls 45 is provided in the wall 44 on the bell) 5.5' side. A closed type cooler 48 formed by connecting a cooling water supply pipe 33 and a drain pipe 34 is installed on the opposite wall 47.

To explain the function of the mold cooling device of such a conventional belt-type continuous casting machine,
Belt rotating 5. Between the two, the molten metal injected from the tundish 9 is cooled by the cooling water injected from the jet pipe 15.15' to the rear surface of the bell) 5.5' in the mechanical part 24, forming a solidified shell. pad 41
．． 41', where the cooling pad 41.4
1' flows out from the slit 36, is further cooled by the cooling water rising along the rectangular groove 46, becomes the thin slab 7, and is rolled downward via the guide roll 11 and pinch rolls (not shown). is derived. In this case, the meniscus portion 24
The cooling water flows through the slit 37 at the top of the cooling band 41.41'.
from the belt 5. to the drain pipe 34, which is a return pipe. The cooling water flowing down the back of the drive pulley 3,
3' to the return p line 23 via the annular groove 22.

However, in this conventional device, a vertical partition wall 45 is provided on the cooling pad 41 μmI to support the belt 5.5'. Sliding resistance occurs between the vertical bulkhead 45 and the bell 5.5', and the installation belt 5.5'. However, there were drawbacks such as vibrations in the engine and drive system.

(Problem to be solved by the invention) Due to the vibration of the belt and drive system caused by the sliding resistance between the belt and the pad fins of the cooling pad, the molten metal in the meniscus moves up and down, and the molten metal on the surface of the slab. This caused wrinkles and double skin. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a mold cooling device for a belt-type continuous casting machine that can prevent vibrations and obtain slabs with good surface properties.

(Means for Solving the Problems) As a means for achieving the above object, the present invention uses fin rolls to support the belt, instead of the conventional pad cooling type device in which the belt is supported by pad fins. This reduces the sliding resistance with the belt.
It is designed to eliminate logarithmic resistance and vibration.

That is, the present invention provides a mold cooling device provided on the back side of a belt in a belt-type continuous casting machine, which includes: a cooling water guide having a plurality of notched grooves with a certain gap from the belt; The mold cooling device is characterized by comprising the belt-tra supporting bottom fin roll having fins inserted into the notch groove, and a cooling pad in the shape of a closed box supporting the fin roll and the cooling water guide.

Hereinafter, the present invention will be explained in detail based on FIGS. 1 to 5.

Fig. 1 is a side sectional view of a belt type continuous casting machine which is an embodiment of the present invention, Fig. 2 is a detailed side sectional view showing a closed type cooler which is an embodiment of the present invention, and Fig. 3 is a side sectional view of a belt type continuous casting machine which is an embodiment of the present invention. Figure 4 is a cross-sectional view of 1+-z and @ in Figure 3.
The figure shows a sectional view taken along line D in FIG. 3.

As shown in FIG. 1, the apparatus of the present invention includes a pair of molding devices 1 below a tundish 9 holding a molten metal 10 (hereinafter referred to as molten metal). The molding device 1 includes tension pulleys 2, 2' at the top, drive pulleys 3, 3' at the bottom, and steering boots IJA, 4' at the rear, with a gap corresponding to the thickness T of the slab 7.
Each is arranged on a base (not shown), and the Boo! J
LL'K The steel belt 5 is also connected to the pulley 2'
A steel belt 5' is endlessly wrapped around the tension pulleys 2, 2'.A large number of annular grooves 12 are arranged in parallel in the axial direction on the outer periphery of the tension pulleys 2, 2', and each groove 12≦ has a jet pipe 13. The jet pipe 15 is connected to the header 14. On the back side of the bell 5.5' between the tension pulley 2.2' and the drive pulleys 3, 3', there is a tension pulley 2.2. The fin rolls 17, 17' are provided directly below the belt 5.5' of the meniscus portion 24 of the molten metal 10, and the fin rolls 17, 17' are provided in the casting area 25 downstream of the meniscus portion 24 directly below the fin rolls 17, 17'. A closed box-shaped cooling pad 55, 55' of the present invention is provided.As shown in FIG. A plurality of chambers (in the embodiment, four chambers 42a, A2b,
45a, 45b). Said horizontal partition wall 2
A cooling water guide 51 is fixed to the tip of the belt 5 side of the belt 5 with a certain gap therebetween, and the horizontal partition wall 28
A vertical partition wall 50 is provided in parallel with the belt 5 at approximately the middle position of 1). An upper slit 37 and a lower slit 36 are provided in the width direction of the belt 5 along the slope of the upper or lower edge of the horizontal partition 28 & at the lower end of the cooling water guide 51 and the upper end of the vertical partition 5G. , the vertical bulkhead 50
A plurality of fin rolls 52 (in the embodiment, 2 to 3 in each chamber) each consisting of a shaft 52a and a fin 52 are provided between the fin roll 52 and the cooling water guide 51. As shown in Figures 5-5,
The fin roll 52 is inserted into a cutout groove 51a provided in the cooling water guide 51, and the fins 521) of the i* fin roll 52 are provided so as to come into contact with the bell 5. As shown in FIG. 4, a plurality of partitions 55 (two in the embodiment) are provided between the cooling water guide 51 and the vertical partition wall 50, and are fixed to the cooling water guide 51. As shown in FIG. 2, cooling water discharge pipes 34 and cooling water supply pipes 33 are alternately provided on the wall 47 of the cooling pad 53 on the side opposite to the belt from top to bottom.

(Function) As shown in Figure 1, each belt 5. The belt 5. A molten metal 10 is injected from a tundish 9 between the facing surfaces. The molten metal 10 is prevented from leaking outward from the belt 5.5' by the short side mold 56 shown in FIG. The fin rolls 17 and 17' are rotated and cooled. Further, the molten metal 10 descends while forming a solidified shell, and in the casting area 25 downstream of the meniscus portion 24, a fin roll 52 and a cooling water guide 5 are formed as shown in FIG.
It is cooled by a cooling pad 53 having a diameter of 1. Here, the cooling water injected from the cooling water supply pipe 53 of the cooling pad 55 enters the chamber 42a or 43a between the wall 47 of the cooling pad 53 and the vertical partition wall 50, passes through the lower slit 36, and the cooling water It rises smoothly between the guide 51 and the belt 5, further cools the casting area 25 as shown in FIG. At this time, while rotating the fin roll 52 in the same direction as the rotating direction of the belt 5, the belt 5 receiving static pressure of molten steel is supported by the fins 52'b of the fin roll 52,
As shown in FIG. 2, the cooling water passes through the upper slit 37, enters the chamber 421) or the chamber 43t, and is discharged from the discharge pipe 34, and the cooling water that has flowed down the back of the belt flows through the drive pulley shown in FIG. It is collected into the return pipe 23 through the annular groove 3.

(Effects of the Invention) As described in detail above, the present invention provides a fin roll in the cooling pad, supports the belt with the fin roll, provides a cooling water guide on the belt side (from the center of the fin roll), and provides cooling water to the cooling pad. Since the cooling water is made to flow between this guide and the belt, compared to the conventional structure in which fins are provided directly on the cooling pad, the sliding of the belt and fins creates rolling resistance, which causes vibrations in the belt and drive system. It is possible to obtain slabs with a surface texture free of horizontal wrinkles and double skin. In addition, the cooling water flows smoothly and provides the same cooling effect as the conventional pad fin system.

[Brief explanation of drawings]

Fig. 1 is a side sectional view of a belt type continuous casting machine which is an embodiment of the present invention, Fig. 2 is a detailed side sectional view showing a closed type cooler which is an embodiment of the present invention, and Fig. 3 is a side sectional view of a belt type continuous casting machine which is an embodiment of the present invention. 4 is a sectional view taken along line 1-B in FIG. 3, and FIG. 5 is a sectional view taken along line DD--D in FIG. FIG. 6 is a side sectional view of a mold cooling device in a conventional belt-type continuous casting machine, and FIG. 7 is a view taken along the line A--A in FIG. Sub-Agents 1) Meifuku Agent Ryo Hagiwara − Sub-Agent Atsuo Anzai

Claims (1)

[Claims] In a mold cooling device installed on the back side of a belt in a belt-type continuous casting machine, a cooling water guide is provided with a plurality of notched grooves with a certain gap from the belt, and fins are provided in the notched grooves of the cooling water guide. A mold cooling device comprising a fin roll that is inserted and supports the belt, and a cooling pad in the form of a closed box that supports the fin roll and the cooling water guide.